This happened in the War of 1812
Answer: President Martin van Buren
Explanation: President Martin van Buren refrained from annexing Texas after the Mexicans threatened war.
The First Continental Congress helped unite the separate colonies
General George Washington was appointed as commander-in-chief of the colonial army, and, as you already know, later became the first president of the United States of America.
Herbert Hoover, who in World War I served as head of the U.S. Food Administration and became know for his humanitarian efforts in Belgium during the war.