State rights the rights or powers retained by the regional government or a federal union under the provisions of a federal constitution!
Hope this helps! Fingers crossed let me know if this is not what you are looking for and I will try and ask my history teacher!
It created a large economy around the business of transportation and it made going around and transporting goods across the states easier witch helped the trade of goods.
Converting Native peoples to Catholicism. This was arguably a noble venture in the minds of the colonists - by converting the Natives, they thought, they were saving their souls. Friars and Jesuits, by the way, were both orders of Catholic priests.
Spain. The Spanish civil war happened in the 1930s.