In what is often regarded as the first ever major amphibious assault by U.S. troops, American soldiers began a siege of which fortified Mexican port city on March 9, 1847?

In what is often regarded as the first ever major amphibious assault by U.S. troops, American soldiers began a siege of which fortified Mexican port city on March 9, 1847?

Tampico
Puerto Vallarta
Manzanillo
Veracruz
Acapulco

The correct answer is Veracruz.