The Tallest Buildings

Today we [look:saw] up into the skies to explore the past and present of the tallest buildings in the world. Skyscrapers were first built in the late nineteenth century. Engineers then probably would not believe the soaring [heights:lengths] of today's tallest buildings. Skyscrapers represent modernity, power, and the expanding boundaries of human [invention:intentions] and new technology. Skyscrapers were invented in the United States. As early as the eighteen-eighties, two new technical developments made these taller buildings possible. One development was the mechanical elevator. It meant that people [would:could] not have to climb many steps to reach the upper floors of tall buildings. The development of steel building technology [also:has] helped make taller buildings possible.