How did fighting during the vietnam war change once President Nixon was elected

Vietnamization became a policy, which meant that the U.S. troops would no longer partake in the Vietnam War. So they helped train and better equip the South Vietnamese forces and assigned them combat roles as the U.S. troops in the war reduced.

Explanation:

the answer here would be

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.