The Roosevelt Corollary in 1904 justfited US intervention in the Western Hemisphere. It was an addition to the Monroe Doctrine which had wanted to prevent European intervention in the West.
Argentina is considered the Most European in South America.
The rise of political power among minority groups has followed the increased salience of issues like immigration, criminal justice reform, and racial bias an inequality.
The U.S. had a victory over British and Indian forces in Ontario, Canada, enabling the United States to consolidate its control over the Northwest.