A treaty/International conventions in other countries. (Outside the US). Most treaties can be about land disputes, military issues, or even just trading.
"To accommodate for lack of dependable rainfall" would be the best option as to why the ancient Chinese organized large groups of people to build and maintain irrigation systems, since when rainfall would not come for long periods of time, the crops would likely die without proper irrigation.
Answer:
The political context surrounding slavery in the years leading up to the Dred Scott decision was one of compromise and sectional tensions
Explanation:
With the opening of Western territories, there was heightened debate between the North and South over the issue of slavery. Attempts to resolve the political tension included several compromises and acts. The Missouri Compromise of 1820 allowed Missouri to enter the Union as a slave state, yet it restricted slavery above the 36°30' line and west of Missouri. The Missouri Compromise was later partially invalidated with the Kansas-Nebraska Act of 1854, and territorial legislatures gained the power to determine whether to enter the Union as slave or free through a process of “popular sovereignty,” or letting the people decide.
