What challenges did the geographical features of the Canal Zone present in building the canal? How were those challenges overcome?

They built new paved roads so that a greater number of dump trucks could remove the excavated earth. They sprayed insecticides to kill mosquitoes and built concrete locks to raise ships to a higher elevation.

Explanation:

native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.