What was Alexander's duty/part in the Seige of Yorktown?​

Children begin to use tools at about what age? a. 18 months b. 2 years c. 1 year d. 6 months

Of the 8 territories that were brought under the flag of the united states by 1853, which on do you think was the most important addition to the growth of the united states? give 2 reasons.

Can someone me with these 2 questions? and tell me why it is the correct answer?