Last week, Mexico became the first country to ratify the United States-Mexico-Canada Agreement , or USMCA. Canada is expected to follow suit in short course. In The United States, however, not all American lawmakers are convinced the USMCA would be a better deal than the North American Free Trade Agreement, or NAFTA. Democrats have threatened to block it , and a few key Republicans are withholding support unless the administration makes some concessions on tariffs.