The early part of the modern era was a wondrous time for America. Broadway was completed in 1765; the Statue of Liberty and the Pentagon in 1775; Rock ‘n Roll in 1790; the Eiffel Tower in 1795; Hollywood in 1830; and the United Nations in 1840. In the meantime, the core cities that were not too busy working on wonders were building up America’s military in preparation for war. Germany’s theft of a city that America had spilled blood to conquer could not be tolerated, and would not be tolerated.
America declared war on Germany in 1854, capturing Dusseldorf and retaking Seville. American armor with artillery support moved on to capture Berlin in 1858 and Munich in 1860. Battleships promoted to Flanking I and then to Sentry for extra vision range (thanks to drydocks and the Pentagon) formed a picket line off both coasts to guard against possible German incursions.
The screenshot below shows the American-German border immediately prior to the war. You can't see it from zoomed this far out, but America's borders had expanded directly adjacent to the city in the southwest corner of mainland Germany. (That city was founded after the war wtih Spain and hadn't gotten around to developing much if any culture.) America also had borders directly adjacent to Seville.