According to the excerpt the iroquois confederacy

The Iroquois are a loose tribal confederation of Native Americans from the Northeastern forests of North America, mostly in what is now New York. With their expansive policy and fighting spirit, they conquered all the surrounding neighbors, both other Iroquois tribes and various groups of Algonquins. In the north, their spread was stopped only by the Abenaki and Sokoki tribes, in the west they spread all the way to the land of Ojibwa, and in the south to the land of Cherokee and Katoba. Descendants of the Iroquois today live on reserves in New York, Ontario, Wisconsin and Oklahoma. Today, they are known as high-altitude workers, who work on assembling steel structures of skyscrapers. In 2020, there are about 70,000 of them all across North America.

the answer is a

their confiscation of contraband and the sinking if the lusitania