What incident occurred that caused an international uproar and for Britain to join the war?

1) Austria-Hungary's attack on Belgium was unacceptable.

2) Germany's attack on Great Britain was shocking.

3) Germany's instrusion of neutral Belgium was not going to be ignored.

4) When Turkey joined the Central Powers, Great Britain had to join the Allied forces.

Thank You And Have A Good Day :)

"the plan of removing the aboriginal people who yet remain within the settled portions of the united states . . approaches its consummation. . an extensive region . . has been assigned for their permanent residence. it has been divided into districts and allotted among them. many have already removed and others are preparing to go. . " removal of southern indians to indian territory, 1835 this passage is most closely related to a) imperialism. b) the civil war. c) westward expansion. d) the french indian war.