Kirsten Hillman, who helped negotiate the U.S.-Mexico-Canada Agreement, has been named ambassador to the U.S., Prime Minister Justin Trudeau announced on Thursday. Hillman has been serving as acting ambassador since August 2019. She was deputy ambassador for two years before that. Trudeau, in his announcement, credited Hillman with playing “critical roles” in the negotiations of USMCA and the Comprehensive and Progressive Agreement for Trans-Pacific Partnership. “When we worked together to negotiate the new NAFTA, I saw Ms. Hillman’s ability to...