What obstacles did the US face in building the Panama Canal? Choose three correct answers.

The three correct answers regarding the obstacles the US faced in building the Panama Canal are:

1. Malaria - The prevalence of malaria and yellow fever posed significant health risks to workers during the construction of the canal.

2. Flooding - Heavy rains in the region often led to flooding, which disrupted construction efforts and made the working conditions more challenging.

3. Mountain ranges - The terrain included mountains and hills that needed to be excavated and navigated, creating engineering challenges.

Terrorism and hurricanes were not major obstacles faced by the US during the construction of the Panama Canal.