Answer: Development of irrigation systems to provide food for themselves
Explanation:
The Indus River valley achievements could be seen in how they developed their irrigation system to provide food for themselves. Enlisted are the following achievements they made;
1) They developed a uniform weight and measures.
2) They were the first to bring about urban sanitization systems.
3) Transportation and trade was their major goal
4) Their art was highly advanced.
Spindletop, texas (southeast texas)
Southern Secession
Northerners believed that the national government's power was supreme over that of the states. Southerners felt that the abolition of slavery would destroy their region's economy. Northerners believed that slavery should be abolished for moral reasons.