Increased suburbanizationvresulted from the
construction of the interstate highway system.
Oklahoma became the 46th state in 1907, following several acts that incorporated more and more Indian tribal land into U.S. territory. After its inclusion in the union, Oklahoma became a center for oil production, with much of the state's early growth coming from that industry.
<span>The Vietnam ceasefire was signed on January 27, 1973.</span>
