Why were political machines difficult to break up?

Brainliestttme : )why was the launch of sputnik in 1957 important? -most in the u.s. had not thought the soviets were capable of producing satellite technology.- it made clear that the u.s. space program was dominant.- most in the soviet union had not thought the u.s. was capable of launching manned aircraft. -it established the fact that a more dangerous hydrogen bomb could be created.

This is the belief that a nation must develop and maintain a strong military force in order to pursue and defend its national interests.

Tension between the british and boers was caused primarily by what things?