1. The Nineteenth Century
Electric power AC and the telephone gave place to the most important advances in years to come in the United States. Electric power AC together with the telephone became the cell phone predecessors. Those innovations boosted the economy and it is even hard to imagine the new era of communications without these two innovations. The United States has kept its first place as world power as a result. The automobile, though not fully developed until the Twentieth Century together with the telephone and electric power AC foresaw future developments that changed communication, commerce and relationships not only around the United States but across the world.
2. The Twentieth Century
Computers, together with internet have changed the way the world communicates today. Computers and internet have empowered the United States to maintain a leading position in the world by speeding up communication and spreading knowledge and technology.
We cannot leave the airplane and antibiotics aside as they contributed greatly to the boosting of the national industry and the winning of war. Antibiotics have contributed greatly to public health.
Answer:
It was harsh for slaves
Explanation: They took people from Africa and made them slaves and that decreased there population
