Either for religious freedom, rights or the country they immigrated from had a dictator. It can be many reasons why they migrate to other countries.
I assume you mean WWI as there were only two. In WWI Americans participated. Many of the able men went to war. While the women, children, and disabled stayed and helped with the war effort. Most of the effort back home was from the women.
There are generally three possibilities for the US to add new states:
Breakup of an existing large state
Conversion of an existing US territory into a state
Annexation (voluntary or not) of either another whole country or part of one, and then conversion into a state.
so yes therefore it is possible
Answer: lack of policy coordination
Explanation:
The United States of America practice federalism in the sense that power is hated from federal to states and local.
One major flaws of federalism the current corona pandemics outbreak has shown us all is the lack of policy coordination between the national, state and local actions. When it comes to public health care they are often in conflict with each other. The lack of policy coordination in the country is severely hampering the task of slowing the growing pandemic.
The transportation innovation of the time period during the Age of Jackson affected migration patterns in the United States because this enabled sectional interdependence. The innovations included turnpikes, steamboats, canals and railroads. Migration has been easier due to the availability of these innovations. Hope this answer helps.