WASHINGTON — The Federal Reserve has left its key policy rate unchanged but signaled that it plans to keep responding to the strong U.S. economy with more interest rate hikes. The next rate increase is expected in December.

The Fed kept its benchmark rate in a range of 2 percent to 2.25 percent. A statement issued Thursday after its latest policy meeting portrayed the economy as robust, with healthy job growth, low unemployment, solid consumer spending and inflation near the Fed’s 2 percent target.

Despite a U.S. trade war with key nations, weaker corporate investment and a sluggish housing market, the Fed is showing confidence in the economy’s resilience. To help control inflation, it has projected three rate increases in 2019 after an expected fourth hike of the year next month.

Analysts saw the central bank’s decision to highlight the economy’s strength and to make few changes in its policy statement as a sign that it remains on track to raise rates next month.

“The Fed’s economic assessment remains very upbeat, noting declining unemployment and continued strong growth,” said Greg McBride, Bankrate.com’s chief financial analyst. “All signs point to a rate hike at the December meeting.”

The Fed’s decision Thursday was approved 9-0 by its voting policymakers. Its brief statement was nearly identical to the one the Fed issued in September. It said the job market has continued to strengthen and noted that economic activity has been rising “at a strong rate.”

In one of its few changes, the Fed downgraded its assessment of business investment spending, observing that it had slowed from its pace earlier in the year.

Analysts will be studying the minutes of this week’s meeting, to be released in three weeks, for any insight into economic threats Fed policymakers may see, such as the trade war between the United States and China.

In deciding how fast or slowly to keep raising rates, the Fed will monitor the pace of growth, the job market’s strength and gauges of inflation for clues to how the economy may evolve in the coming months. The brisk pace of economic growth – a 3.5 percent annual rate in the July-September quarter, after a 4.2 percent rate in the previous quarter – has raised the risk that inflation could begin accelerating.