James K. Polk was the first U.S. President to promote what later on would be called 'Yankee Imperialism.' During Polk's presidency, the U.S. expanded significantly with the annexation of the Republic of Texas, the Oregon Territory, and the Mexican Cession following the American victory in the Mexican–American War. [The Mexican-American War was an illegal conflict started by Polk for the sole purpose of stealing Mexican lands.]
Yankee Imperialism was started by stealing lands from their rightful owners. The same thing that the Israeli Zionists are doing today in the area now called Israel, which used to belong to the Palestinians.
Zionists + Yankees = Thiefs of the Worst Kind.
Part of the above, but not all, was taken from Wikipedia.
Now you know how Yankee Imperialism started.
USA and Israel are big 'partners in crime.'