The best place to start a company is Delaware. It has the most protections for businesses and has a long history of being the state of incorporation for almost all of the major companies in the United States.

The incorporation process can be difficult but there are some services that help like nitrouscompany.com.

If you need any help feel free to reach out.

Well, the obvious answer is Delaware, USA. It's very inexpensive there to incorporate, and state taxes and fees are very low.

Canada for sure

There are a few parts to consider. Are you a U.S. tax resident and working from the U.S., or do you live and work from Canada? If you're a U.S. resident, you're generally subject to income taxes on your worldwide earnings, regardless of source. The U.S. revenue from sales to U.S. based customers are subject to federal income taxes and likely state income taxes.

Some of the more popular jurisdictions to form a U.S. entity are Delaware and Wyoming, because of the strong business laws, privacy protections and no state income taxes.

Your sales to Canadian customers may be subject to taxes in Canada. You'll need to assess whether you can leverage treaty benefits under the U.S.-Canada tax treaty. The treaty provides relief regarding what constitutes a permanent establishment in each country, and if you operate a Canadian corporation for your Canada business, the treaty provides reduced dividend withholding tax rates on repatriated profits.

Delaware and Nevada get all the Hype but Wyoming and Kentucky are also good options.

Kentucky has no Annual Fee, Limited Liability Protections (individuals can not be sued if the business is), protection of personal assets, Do not need a Registered agent, remote businesses are allowed. (i only touched on Kentucky because most people know about the other 3.

Most fortune 500 companies are registered in Delaware, however, Nevada has replicated most of the benefits of Delaware. Nevada also has no taxes and makes it extremely difficult for your corporate veil to be pierced.