What factors enabled the city to survive foreign attacks for hundreds of years before finally falling?

Below is a description of a resource that you're considering using for a research paper. as you read the description, keep in mind what you've learned about historical thinking skills and use those skills in evaluating whether or not to use the source.

Restricting immigrants from entering a country may be based on what belief?  

You are a migrant worker from india who has come to key wait image and you do you are you most likely to seek work