In the early 19th c., the South of the country tended to oppose tariffs. As you may already know, the South opposed many things, slavery being the most important thing. 
        
             
        
        
        
<u>Answer:</u>
The strong politics of radical reconstruction was largely ineffective in changing the attitudes of White southerners towards African Americans because the white southerners were not mentally ready to accept African Americans as socially equal human beings.
<u>Explanation:</u>
- The efforts taken by radical Republicans in the 1860s and 1870s in order to establish a society without the prevalence of racial discrimination mostly proved unsuccessful.
 - The fact that the African Americans were relieved from slavery forever angered most white southerners and culminated in violent clashes between the two.
 
 
        
             
        
        
        
It transported livestock, crops, and diseases among Africa, Europe, Asia, and the Americas.
The Columbian Exchange was the exchange of items which began during the period of exploration in the 15th century. 
The Columbian Exchange moved crops from the Old World to the New World and vice versa. Tomatoes, potatoes, corn, and pumpkin were all transferred to Europe becoming staple food crops for many countries. Europeans brought disease, domesticated animals, rice, onions, and sugarcane to the Americas. Africa was introduced to new foods and manufactured items in exchange for slaves to work plantations in the New World. 
 
        
             
        
        
        
A is the correct answer .
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During the 1800s, thousands of settlers traveled west in search of new land and opportunities. Many families traveled in wagons. They followed overland trails across the continent. These trails were often dangerous and difficult to travel on. For settlers to reach the California coast they had to cross the Rocky Mountain chain.The settlers had to cross the Rocky Mountains to reach Oregon's Pacific Coast.