Metal roofs, as evidenced by their 50-year lifespan, outlive asphalt shingles by more than three times their lifetime. While asphalt shingles are easier to install than metal roofing, they require regular maintenance and will need to be replaced in 15 to 30 years, which means an added cost to homeowners.
The term Modern era, Modern period, or Modern Times is used by historians to loosely describe the period of time immediately following what is known as the early modern period. It is to be distinguished from the term of Modernity. 1. The early modern period lasted from the end of the 15th century to the middle of the 18th century, circa 1450 (moveable type printing press etc) and 1492 (start of European Colonialism) to 1750 (the Enlightenment) and the beginning of the Industrial Revolution. 2.
Confidence votes 658. The Progressive Era is a widely recognized period in American history which is generally considered to have begun around 1900 and to have ended with America's entry into the First World War in 1917. Since the intensity of progressive reform peaked during that time, the designation is appropriate.hus the roots of American Progressivism are deep and wide, but the last decades of the 19th century created conditions that cried out for reform.