The monroe doctrine (1823) could have been used in response to which of these events?
a ) the french invasion of mexico by napoleon 11
b ) the secession of south carolina from the union
c ) the removal of indian cultures from the american west
d ) the war with mexico for control of the american southwest

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.