Answer: United Kingdom, Mexico, Spain, Germany, Austria-Hungary, Italy, Bulgaria, Hungary, and Romania.
Step-by-step explanation:
War of 1812: President James Madison declared war on the United Kingdoms, June 18, 1812.
Mexican-American War: President James K. Polk declared war on Mexico, May 13, 1846.
Spanish-American War: President William McKinley declared war on Spain, April 25, 1898.
WW1: President Woodrow Wilson declared war on Germany, April 6, 1917 and then declared war on Austria-Hungary, December 7, 1917.
WW2: President Franklin D. Roosevelt declared war on Japan and Italy December 11, 1941. Then declared war on Bulgaria, Hungary, and Romania, June 5, 1942.