transcontinental railroads {Ans: During the Civil War, Congress authorized land grants and loans for the building of the first railroad that crossed the entire country. The Union Pacific started in Omaha, Nebraska, and the Central Pacific started in Sacramento, California. On May 10, 1869, at Promontory Point, Utah, a golden spike was driven into the rail ties to mark the completion of the railroad. (p. 321)}Alexander Graham Bell {Ans: In 1876, he invented the telephone. (p. 325)}Great Railroad Strike of 1877 {Ans: In 1877, this strike spread across much of the nation and shut down two-thirds of the country's railroads. An additional 500,000 workers from other industries joined the strike. The president used federal troops to end the violence, but more than 100 people had died in the violence. (p. 329)}Andrew Carnegie {Ans: A Scottish emigrant, in the 1870s he started manufacturing steel in Pittsburgh. His strategy was to control every stage of the manufacturing process from mining the raw materials to transporting the finished product. His company Carnegie Steel became the world's largest steel company. (p. 323)}concentration of wealth {Ans: By the 1890s, the richest 10 percent of the U.S. population controlled 90 percent