In its final policy meeting of a tumultuous year, when it was spurred to cut interest rates three times to forestall a slowdown fuelled largely by President Donald Trump's trade war, the U.S. central bank struck a remarkably sanguine tone, confident the actions it had taken so far are working.

"Our economic outlook remains a favourable one, despite global developments and ongoing risks," Fed Chair Jerome Powell said in a news conference shortly after the release of the latest policy statement and new quarterly economic projections.

"As the year progressed we adjusted the stance of monetary policy to cushion the economy and provide some insurance ... This shift has helped support the economy and has kept the outlook on track," he said.

The policy decision left the Fed's benchmark overnight lending rate in its current target range between 1.50% and 1.75%, three-quarters of a percentage point below where it started the year.

And after broad disagreement earlier over the direction of policy and dissents at its last four rate-setting meetings, the Fed ended the year on the same page. The vote on its latest policy statement was unanimous, and the new economic projections showed 13 of 17 Fed policymakers foresee no change in interest rates until at least 2021.

The other four saw only one rate hike next year.

Notably, no policymakers suggested lower rates would be appropriate in coming months.

Combined, it's evidence of a central bank in which the most "dovish" members feel the current low level of interest rates will allow job and wage gains to continue, while the most "hawkish" feel inflation will remain contained - a soft landing for both sides after a year in which recession risks rose, the U.S. bond yield curve inverted, and trade policy disrupted markets.

Powell, who at the start of his news conference read a brief tribute to the late Paul Volcker, the Fed's inflation-fighting former chairman, said the central bank now sees the connection between low unemployment and inflation as "very faint."

"We don't have to worry so much about inflation," Powell said, adding it would take a "persistent" jump in the pace of price increases for him to think it warranted higher interest rates.

While the decision not to cut interest rates further may irk Trump, who has demanded even lower borrowing costs, the Fed's underlying message that the U.S. economy is in a "good place" bodes well for the Republican incumbent's reelection.

The only two sitting presidents in the modern era not to have won reelection - Jimmy Carter and George H.W. Bush - both contended with unemployment rates more than twice the level under Trump. The U.S. jobless rate is currently 3.5%.

Still, the Fed noted, global risks warrant monitoring in the midst of an ongoing U.S.-China trade war, as does the possibility of a downshift in public inflation expectations.

Overall, Fed policymakers see the unemployment rate staying below their estimate of the long-run sustainable level for another three years, even as most expect inflation by then to end up at, or just a little above, the central bank's 2% target, the new projections showed.

"I think we’ve learned that unemployment can remain at quite low levels for an extended period of time without unwarranted upward pressure on inflation," Powell said.

Compared to the 1990s, he said, when the Fed cut rates as an insurance policy against a recession and then raised them again to prevent a tight labour market from fuelling unwanted price rises, today "the need for rate increases is less."

Indeed, the projections also showed policymakers as a group expect interest rates to remain accommodative - that is, below the 2.5% they estimate neither stimulates nor restricts economic growth over the long run - through at least 2022.

U.S. stocks rallied modestly after the decision, which had been widely anticipated by investors. The benchmark S&P 500 index, which was largely flat when the Fed announced its policy decision, closed up about 0.3%.

Yields on U.S. Treasury securities fell in afternoon trading, with the 10-year note last yielding 1.79%. The dollar slid to a four-month low against a basket of major trading partner currencies.

MATERIAL CHANGE

After the Fed's October policy meeting, Powell said it would take a "material" change in the economic outlook for the central bank to change rates again, language he repeated on Wednesday without elaboration. The Fed cut rates three times this year, including in October, "strong measures" that Powell said will take some time to fully show up in the economy.

"It's 'steady as she goes' from the Fed today – the statement provided little groundbreaking news on the path of monetary policy," Jason Pride, chief investment officer of private wealth at Glenmede Trust Co, said in a statement.

"The prevailing message out of today's meeting is that the Fed remains on hold, barring any material upside surprises for inflation," Pride said.

The new economic projections showed little change from those in September, as policymakers sketched out an economy they feel has skirted recession risks and is poised to grow close to trend for several years more.

A reference in the October policy statement to "uncertainties" about the economic outlook was dropped.

U.S. gross domestic product at the median is projected to grow 2% next year and 1.9% in 2021, which is far short of the 3% annual growth Trump promised to deliver.

Unemployment is seen remaining at 3.5% through next year, rising to 3.6% in 2021. In a demonstration of the disconnect between that low level of unemployment and inflation, the pace of prices increases is expected to rise only to 1.9% next year.

By Howard Schneider and Lindsay Dunsmuir