Let's start off with what a brief explanation of what social stratification is; Social stratification is a persons ranking in society. Whether it be financial wise (the most common), the age group, education, and even family power. An early form of this could be the Roman Empire's hierarchical structure; they had the lowest class which would be the slaves and then would work their way up to the highest class which would be the Emperor.
I hope this helped.
If you allow credit, most people would not payback money. Forgetting credit is the similar to loan, many people spent their loaned money unwisely.
Answer: the British promised to give the western land back to the native American
Explanation: the white settlers keep going westward that tried to push them back