During the late 19th century many environmental problems caused changes and created public awareness. One problem was that the country could soon run out of vital natural resources like wood. This led many people to join the “conservation movement” in the early 20th century in order for future generations to have enough supplies that were made from raw materials. Another problem was the fate of the “wilderness”, so many organizations began to fight for undeveloped lands should be preserved. Lastly, one big problem was pollution. This issue was a big threat to the fast-growing cities, which led to efforts in order to improve the urban environment. There were also some changes and the popular sports. During the late 19th century the Olympic started to become an international spectacle. Apart from that there were also many games like baseball that started to grow in popularity. Due to many segregational beliefs during this time there were many only African American teams that were created.
One last thing that changed during the nineteenth and twentieth century was the art of the United States. Abstract expressionist movements started after World War II. Later came minimalism and pop art.
Popular Sports and Art weren't as culturally prominent until the 1920s. Environmental Protection started around the second Industrial Revolution because factories were using way too many resources. Environmentalists wanted to make sure future generations had natural resources to exhaust too. Theodore Roosevelt made regulations forbidding hunting of endangered animals and tree planting programs to make sure we would have a fresh cycle of lumber instead of waiting fifty years for wood to grow.
B. Pax Mongolica. In Pax Mongolica, there is relative peace that happened after Kublai Khan was killed. Resulting to this, the re-opening of Silk Road gave way to transfer to culture, tradition, and trades, and religion.
The other method of passing<span> an </span>amendment<span> requires a </span>Constitutional<span> Convention to be called by two-thirds of the legislatures of the States. That Convention can</span>propose<span> as many </span>amendments<span> as it deems </span>necessary<span>. </span>Those amendments<span> must be approved by three-fourths of the states.</span>