To answer this, you'll need to research other countries' legal systems, and then compare/contrast them with that in the US.
If you need help learning how to search, including how to choose good search terms, go here and scroll down to the links under HOW TO SEARCH THE INTERNET:
http://hanlib.sou.edu/searchtools/
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Why is it important to have laws?
Is the legal system that we have adopted the most efficient legal system?
2 answers
You might also like to consider what is meant by the 'most efficient'.
Is this the quickest or lowest cost perhaps?
Is this the quickest or lowest cost perhaps?
1 answer