What were the main challenges to building the panama canal? select three options. dealing with the cold climate facing floods and mudslides dealing with a hostile local population designing the lock gates facing diseases such as malaria]

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b.   jim crow laws were enacted in northern states.

b) the confederacy had to pay all union war expenses.

in the declaration of independence, thomas jefferson announced that every human being has “certain unalienable rights,” among which are those to “life, liberty, and the pursuit of " hope i