What was a major reason for the population explosion in europe between 1800 and 1900?

What was the biggest role in connecting rome with rich regions

Why was there so little resistance in the war from the german people?

Which of these actions were taken by the us government to get ready for war? check all that apply. using a draft to build armed forces planting victory gardens for food and to boost morale promoting conservation of key products trying to get people to buy liberty bonds taking new jobs to meet demands promoting patriotism