With a sole proprietorship, anyone who wants to become self-employed in the USA can easily set up their own business. As the name suggests, the prerequisite is that it is founded and managed by an individual. However, you can hire as many employees as you like from the start, or with increasing business success.
The sole proprietorship is an independent legal form, which stands on equal footing with corporations that are also managed by a single person. However, to create a corporation, the law often prescribes a minimum capital amount necessary. This isn't the case for sole proprietorships, making it much easier for young entrepreneurs to move into self-employment. This is one of the most important reasons why the sole proprietorship is the most widely used business structure in the USA.