During the late 1800s, presidents and governors most often used military force during the labor-management conflicts as a way to (1) support industrialists and end strikes
(2) make employers sign collective bargaining agreements
(3) protect workers from the private armies of employers
(4) replace striking factory workers with soldiers

Option: (1) support industrialists and end strikes

Explanation:

As industries began to come up in cities and towns, people from rural areas began to arrive in search of work. Many of the rural population arrive in cities and towns to work. The working condition was worse in industries as they forced to work in a noisy, dirty, unhygienic place with no ventilators to breath fresh air. Working shifts were long as they work for more than 10 hours in a day. Wages were low, with a frequent reduction in pay.

To oppose restriction, they conducted strikes. These strikes demanded better wages, fixed working hours, and better working conditions. But their voices were suppressed by the government as they were in support of industrialists. Presidents and governors often used military force to end strikes.