In 1896, in the case of Plessy v. Ferguson, the Supreme Court declared the "separate but equal" doctrine. It upheld the rights of governments to set up separate schools and separate public facilities for blacks and whites so that blacks and whites could be "equal." However, they were far from equal.
Let me handle your first question -- always good to do one question at a time here. :-)
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.
The Aztec built bridges and causways to get to certain areas without getting wet.
It would be the "Ku Klux Klan" that is considered to be a domestic terrorist group, since they have a long history of intimidating people (especially blacks and Jews) with whom they disagree and degrade.
Answer:
<h3>1. General Washington decided not to impose a battlefield strategy on his field commanders.</h3>
<h3>2. Washington decided to oversee renovations on Mount Vernon during the most tenuous year of the Revolution.</h3>
