There are many types of business available to start in the United States:

1. Sole Proprietorship:  A sole proprietor business allows the owner and the business to act the same. This means that any liability the company has falls directly on the owner. 

2. Partnership: This business structure allows individuals to enter into a business agreement with a partner. This combines the financial backing but also the financial obligations of the business between the partners. There is a general partnership where both partners are equally liable in the business. In addition, there’s a limited partnership where one partner can contribute to the business but does not have the power to make decisions and lastly a limited liability partnership where all of the owners/partners have limited personal liability to them. 

3. Corporation: When a corporation is filed, it is a separate entity from it’s owners/shareholders. This means the business will have separate financial obligations.