What percent of families on the TV set by the end of the 1950s

By 1957, Americans were able to watch 450 stations across the U.S. on 37 million TV sets; by 1960, nearly 90% of households had a TV.

the hereditary right of a monarch to rule from the mandate of heaven

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.