Texas became part of the United States in 1845 when it was acquired in a treaty with Spain.
captured in a conflict with Mexico.
O purchased from Mexico.
annexed as an independent republic.

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.