This statement is true. There are several different events that show America is far from isolationist during this roughly 160 year period. Here are some examples of major events that show America's lack of isolationism.
1) Manifest Destiny- During this era in American history (early to mid 19th century), the US gained thousands of miles in territory from countries like France (through the Louisiana Purchase) and Mexico (through the Mexican-American War and Mexican Cession).
2) Imperialism- The era of American imperialism (late 19th and early 20th century) resulted in the US expanding their territory, annexing places like Puerto Rico and Hawaii.
3) World War I (1917-1919)- The US got involved in World War I after Germany made several actions that upset the American government and citizens. This includes the sinking of the Lusitania and the Zimmerman Telegram.
Bragg’s inaction turned a tactical triumph for the South into a strategic defeat, as Union forces were allowed to get safely to Chattanooga. The Confederates subsequently put that city under siege, but in October General Ulysses S. Grant<span> arrived with reinforcements and took over the Union command in the region. </span>
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<span><span>Allies:Delian League (with Athens clearly the most powerful); Athens taxed and protected other city-states.</span><span>Military strength:<span>Strong navy.</span></span></span></span>
I'm not sure, but is most likely B. West Africa, Because The West Side Is Where The Boats Came In.