This Century!!!!! (21st Century)
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Western Airlines (Jet Blue, South West Airlines etc.) have more security because of the 9/11 terrorist attack so less terrorists and mentally ill criminals can come in and commit mass crimes. The cities most visited have the most care for and money spent on development making living there or visiting there very expensive, especially in the West. Back then it took 2 months to travel to the west in a wagon, a week on a train, 2-4 days in a car and now only 4-6 hours on a plane. To send a letter it took a week and now emails take 2 minutes to receive, it shows how fast you can communicate with people. The plow machine (used for farming) has helped made more land usable in a short amount of time. Railroads carried mass-produced goods, many of them the rule of new technologies around the west. Trains were a big thing and is still used today unlike wagons, but have not been changed much like cars have. There is a lot of improvement done by computers so they don't have to work as much anymore.