Answer: Rail roads.
Explanation: Rail road technology was used to link the states on the eastern part of USA which compromises of ME-Maine; NH-New Hampshire; VT-Vermont; NY-New York; MA- Massachusetts; RI-Rhode Island; CT-Connecticut; NJ-New Jersey; PA- Pennsylvania; DE-Delaware; MD-Maryland; DC-District of Columbia to western states which were Alaska, Arizona, California, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, and Wyoming. this help made traveling faster.
