During the gold rushes of the 1840s and 1850s, the towns that developed near mines were called boomtowns because _____.
Athey were built quickly
Bfew people lived there
Cexplosives were used in mines
Dbusinesses were built there
Athey were built quickly
Bfew people lived there
Cexplosives were used in mines
Dbusinesses were built there