Answer:
Slavery started in the North American colonies for two main reasons. First, there was a need for unfree labor. Second, other sources of unfree labor dried up and/or became less acceptable to the colonial elites. First, slavery started in the colonies because the rich planters in the colonies needed workers who were not free.
Explanation:
I would say to show that your source is credible!
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Answer: A. Cavalry
Explanation: The "blitzkrieg" is a military tactic that was created by the Germans during World War 2. Speed is a requirement as a blitzkrieg is meant to overpower the enemy before it has time to prepare for battle or receive aid from allies. Tanks and planes are also key components as they are powerful and maneuverable, which is also needed for a blitzkrieg to be successful. Cavalry is not, and never was, needed for a blitzkrieg.
