Question

1. what key event led to american forces defending the alamo building against the mexican army?

spanish missionaries asked them to preserve the historic building.
mexican president santa anna went there to arrest stephen austin.
women and children were still inside the building when the siege by santa annas army began.
colonel james bowie was unable to disarm the fort before the mexican army arrived.

Explanation:

The Alamo was a former Spanish mission. During the Texas Revolution, Colonel James Bowie was in charge of the Alamo. He was unable to disarm the fort before the Mexican army arrived. This led to American forces defending the Alamo building against the Mexican army.

Answer:

Colonel James Bowie was unable to disarm the fort before the Mexican army arrived.