One year ago today on December 6, 2017, President Trump officially recognized Jerusalem as Israel’s capital and directed the State Department to move the US Embassy from Tel Aviv to Jerusalem.
During the announcement, President Trump pointed to the 20-year delay of previous presidents in acting on the Jerusalem Embassy Act of 1995--
"In 1995, Congress adopted the Jerusalem Embassy Act, urging the federal government to relocate the American embassy to Jerusalem and to recognize that that city — and so importantly — is Israel’s capital. This act passed Congress by an overwhelming bipartisan majority and was reaffirmed by a unanimous vote of the Senate only six months ago.
Yet, for over 20 years, every previous American president has exercised the law’s waiver, refusing to move the U.S. embassy to Jerusalem or to recognize Jerusalem as Israel’s capital city."
President Trump also made clear this announcement is not intended to interfere with peace talks between Israel and Palestine:
"I also want to make one point very clear: This decision is not intended, in any way, to reflect a departure from our strong commitment to facilitate a lasting peace agreement. We want an agreement that is a great deal for the Israelis and a great deal for the Palestinians. We are not taking a position of any final status issues, including the specific boundaries of the Israeli sovereignty in Jerusalem, or the resolution of contested borders. Those questions are up to the parties involved."
President Trump ended by saying:
"God bless Israel. God bless the Palestinians. And God bless the United States."
You can read President Trump's full announcement of this historic event at whitehouse.gov.