What 2 groups of countries fought each other in war

world war 1 allies vs central powers

world war 2 allies vs axis

Explanation:

fear of soviet expansion into space led to the development of the u.s. space program. option d is correct.

the orbiting of sputnik by the soviet union on oct. 4, 1957 resulted in a worldwide fear of weapons of mass destruction. lyndon b. johnson, (lbj), d-texas, who was then-chairman of the senate preparedness investigation subcommittee of the senate armed services committee, was concerned that the soviet union was surpassing the united states in missile technology.