WASHINGTON—President Donald Trump, along with the president of the Democratic Republic of the Congo, Felix Tshisekedi, and the president of the Republic of Rwanda, Paul Kagame, signed a historic peace agreement dubbed the Washington Accords to officially bring an end to a decades-long conflict between the countries.

The leaders signed the Washington Accords at the recently renamed “Donald J. Trump Institute of Peace,” previously known as the Institute of Peace, on Thursday afternoon.

“In this holy season we prepare to celebrate the birth of the Prince of Peace, we have come to the U.S. Institute of Peace, to sign a historic agreement that will end one of the longest-running conflicts anywhere in the world, with far more than ten million people killed,” Trump said.

“Today, we commit to s

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