Essay question: what were three important innovations of the late nineteenth and early twentieth centuries, and how did each innovation change life in the united states?

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.

studies show tha in 7.5 billion years from now, the expanding sun will engulf, and destroy, the earth.

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on