The Pierce Administration's Secret Scheme to Gain Control of Cuba

Multiple Choice

The Pierce administration's secret scheme to gain control of Cuba was stopped when

A) Spain threatened a preemptive war against the United States.
B) the secret Ostend Manifesto was leaked to the public.
C) United States leaders signed the Clayton-Bulwer Treaty.
D) Spain declared that it would abolish slavery in Cuba.
E) United States adventurers bungled their invasion.