 Instead, the CIA started to organize plans to destabilize and to overthrow General Velasco.US-Peru disagreements continued over a broad range of issues including even Peru's claim to a fishing limit that resulted in the seizure of several US commercial fishing boats and the expropriation of the American copper mining company Cerro de Pasco Corporation.However, in spite of these provocations, the U.S. responded immediately with humanitarian aid in 1970, when an earthquake killed about 50,000 persons and left over 600,000 homeless.