African slaves and indentured servants
The correct answer is Germany.
During World War I, Germany attempted to send the Zimmerman Telegram to Mexico. In this telegram, the Germans asked Mexico to invade the United States. The Germans asked of this because they knew if the United States was fighting with Mexico, they would not get involved in World War I. This would increase the chances of German success in this war.
The Zimmerman Telegram, however, was intercepted by allied forces and given to the American government. After reading this telegram, the American government declared war on Germany, essentially having the exact opposite outcome that the Germans were hoping for.
American leaders were feared that the United States would shut out of the valuable china trade.
Before the arrival of Europeans, many North American populations used their environments as a means to survive. For example, many indigenous populations hunted animals, grew crops (like corn), and moved constantly in order to follow big game (such as buffalo). Regardless, many populations did not view land as something that can be possessed by one individual or group. Rather, they saw land as something that all members of the community could use.
This drastically changed with the arrival of Europeans. During this time, Europeans viewed land as something that individuals controlled. Along with this, land was viewed as extremely valuable due to the resources it could provide. These differing views of land caused significant problems between Europeans and indigenous people.