Trump administration turns its focus on getting the deal through a divided Congress and toward even larger economic feuds with China.

Investors greeted the completion of a new North American trade pact with relief Monday, lifting most indexes, as the Trump administration turned its focus on getting the deal through a divided Congress and toward even larger economic feuds with China. Uncertainty about trade has been a worry of businesses and investors for months, after Mr. Trump began advancing an ambitious agenda that included a new North American Free Trade Agreement, tariffs on U.S. metals imports and a rewrite of U.S. economic ties with China. The new U.S. Mexico Canada Agreement, which will replace Nafta, alleviated some, if not all, of those concerns. Among other things, it allows auto makers and other multinational companies to keep intact the complex and costly supply chains built across the continent since Nafta was completed in 1994. It also won new concessions for U.S. farmers and created new rules for digital commerce across the continent.

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