How long would it take to build a cathedral?

300 years or half a century

Across 217 church and abbey projects in England, construction took an average of 250–300 years. And St. John the Divine is not alone among the ranks of unfinished cathedrals. Perhaps most famously, Gaudi's Sagrada Familia has been under construction since 1882.Completion of a new cathedral usually took at least half a century, and many took much longer, involving generations of architects and workers. Since construction could take so long and was so expensive, portions of many cathedrals were built in several successive styles, and many were left unfinished.

in 1803 the louisiana purchase took place, doubling the size of the country. by 1840 almost 7 million americans had migrated westward in hopes of securing land and being prosperous. the belief that settlers were destined to expand to the west is often referred to as manifest destiny.

explanation:

b. native americans them