Ok. That's good. While law only says, "substantial investment", for the E-2 visa they usually look for around $200,000 or more. This is because anything less is a weak case that could easily fail. And they will not approve a visa for a business that they think will easily fail and you would end up being out of status. The reason I ask where you plan to invest is because if you go to a big city, Las Vegas, New York, Los Angeles, Miami, Dallas, Atlanta, Chicago, etc., where most people want to live, the cost of living and doing business is much higher. Because you have $200,000 or so, you should be ok. If you wanted to invest less and still do an E-2 you could open the business in some small town in the middle of nowhere that has a very low cost of living and doing business, like maybe a small town in North or South Dakota, Utah, Nebraska, etc. But with a $200,000 investment, you should be ok in Houston, TX.
Here is a link to the E-2 if you want to read more:
Since you own a business outside of the U.S. for more than 1 year and will continue to run that business, you can invest $100,000 or more in a U.S. business (doesn't have to be the same business, but must be related by ownership) and you can try for an L-1A visa. Here is a link to that, but keep in mind that both businesses have to be run and should be successful. You can't just come to the U.S. and forget about the business outside and let it die:
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