The american space program went through three phases in the 1960s. the program started it all and used a single-passenger craft.

It began with the Mercury program which used a single-passenger spacecraft.

The American space program went through three phases in the 1960s. The Mercury program started it all and used a single-passenger craft.

D)Tensions created by Johnson’s vetoes led to major conflict with the president

 The tension culminated in an effort to impeach the president. The president was for a lenient measure against the southern states that had seceded while the republican congress was for harsh reconstruction measures.