In 1898 president mckinley sent the battleship maine to havana to negotiate peace with spain evacuate americans if necessary put down riots by spanish loyalists put down the cuban rebellion

Evacuate Americans if necessary

Explanation:      

The objective that this decision had was to protect the interests of the United States in Cuba since the situation with Spain was going through some difficulties.

The U.S Maine was a reminder for Spain that demonstrated the concern that U.S had about Cuba. However, everything resulted in a war delaration from the U.S to Spain in April 1898.

europe would not recognize the confederacy as an independent nation.