Following WWI the American public and also those in government believed that this war was a disaster and they sought to prevent U.S. entry into major wars such as what came at the outbreak of WWII. There were also laws in place such as the Neutrality Acts which prevented the U.S. from selling arms or supporting states that were actively at war. These provisions were eventually disregarded when the U.S. entered the war on the side of the Allies.
Answer: During the war 17 million new civilian jobs were created, industrial productivity increased by 96 percent and corporate profit after taxes doubled.
Prior to President Theodore Roosevelt, those who preceded him in federal government had tended to side with industry leaders, expecting laborers to fall in line and do the work for the good of the companies. In 1902, when there was a particularly tense strike by coal workers, Roosevelt invited both sides (labor leaders and management leaders) to the White House to negotiate. This was an example of the way he saw the role of government leadership as "steward" to the nation, mediating on behalf of everyone's interests, not just the interests of a powerful small group. His "Square Deal" policies were aimed at making things fair and square for the general public. An example of this would be how much land was set aside under his administration as national forests, national parks, national monuments, etc. He was seeking to protect the use of the land for all Americans' interests, rather than letting corporations tear into any land or forest they wanted in order to grab natural resources.