Industrial Revolution
?
High birthrate but few
children lived long enough
to reproduce
19th century
?
Took this entire time
period for the population
to double
Preindustrial
society
2
.
When population doubled
twice
20th century
When human population
exploded

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers