Match each item to the time it best represents. late 1960s
1. humans began using stone tools
birth rates declined, and the average life expectancy
2.
increased

Paleolithic Era
3. the world population totaled six billion people
Industrial Revolution
4. the annual population growth rate reached its peak
1999

What will not cause political parties to change or develop

Which sentence best explains how steam power changed agriculture in england between 1810 and 1850? a. farmers started using steam-powered machines to spray chemical fertilizers and pesticides. b. livestock farmers began using steam-powered machines to milk cattle and shear sheep. c. steam-powered railways transport and sell agricultural produce far from where it was grown. d. steamships to transport large numbers of people from the united states to english farms.

What was the historic border between the united states and mexico?