To cut off budget support for that policy
I think it is b because i know all other sources can be a freshwater ecosystem and swamps have a freshwater and salt water kinds so ya
The Ghost Dance. During a solar eclipse on January 1, 1889, Wovoka, a shaman of the Northern Paiute tribe, had a vision. Claiming that God had appeared to him in the guise of a Native American and had revealed to him a bountiful land of love and peace, Wovoka founded a spiritual movement called the Ghost Dance.
Conquistadors.
It's a complicated combo of better weapons,, and diseases.