In the event known as black monday, nixon ordered attorney general richardson to fire the special prosecutor investigating the watergate break-in.

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This statement is false. It was not in the event known as Black Monday that Nixon ordered Attorney General Richardson to fire the special prosecutor investigating the Watergate break-in, however, it was the Saturday Night Massacre. 

The correct answer is Panama.

The United States invaded Panama in an attempt to overthrow its military dictator Manuel Ortega. This operation was named Operation Just Cause and it occurred between mid-December 1989 and late January 1990.

Manuel Ortega was indicted in the United States on drug trafficking charges. He was also accused of suppressing democracy in Panama and putting many lives at risk.

During the operation, Ortega was deposed, his Panamanian Defense Forces crashed and he surrendered on January 3, 1990.

Following, president-elect Guillermo Endara was sworn into office.