As possible sites for a canal, what do mexico, costa rica, panama, and columbia have in common

There are many things that they have in common. First of all, they are relatively close. Also, they are in contact with the Pacific Ocean, and also with either the Caribbean Sea or the Gulf of Mexico, which make them ideal for building canals for shipping routes. Also, they have been historically related because, even though Mexico isn´t part of Central America, the state of Chiapas used to be part of the Captaincy General of Guatemala, which also incluedd Costa Rica.

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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the answer is a. laws were enacted in the aftermath of the plot to make it harder to free slaves,increasing sectionalism