A( takes an act of two-thirds of congress and ratification by three-fourths of the states.
a. civil rights bill
b. amendment
c. clause

An amendment takes an act of two-thirds of Congress and ratification by three-fourths of the states. The changes in the amendment could be proposed either in Congress or states. The proposal must have 2/3 of both houses in congress agreeing to the amendment. Meanwhile, the state must as well have 2/3 of the state legislatures to propose the amendment. Regardless of whoever proposed the amendment, it must be ratified by ¾ of the states. 

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;