What caused the debate over slavery to increase

These seven factors contributed to the rise of the slave trade:

1.)The importance of the colonies of West India.

2.)The labor shortage.

3.) The inability to identify alternative suppliers of labor.

4.)Juridical position.

5.) Racist stances.

6.)Religious variables.

7.)Military variables.

Explanation:

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your answer is d

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answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: