To get orders from U.S. you must understand the order execution properly. Once you understand that, you can get orders from any country.
When an investor places a trade, whether online or over the phone, the order goes to a broker. Obviously, they may be more inclined to internalize an order to profit on the spread or send an order to a regional exchange or willing third market maker and receive payment for order flow. While many orders sent into a broker are market orders, others may have conditions attached to them that limit or alter the way in which and when it can be executed. By law, brokers are obligated to give each of their investors the best possible order execution. You place the market order, and it gets filled at $40.10. However, the market itself, and not the broker, may be the culprit of an order not being executed at the quoted price, especially in fast-moving markets. In addition, when a broker, while executing an order from an investor using a limit order, provides the execution at a better price than the public quotes, that broker must report the details of these better prices. With these rules in place, it is much easier to determine which brokers get the best prices and which ones use them only as a marketing pitch. Additionally, the SEC requires broker/dealers to notify their customers if their orders are not routed for best execution.
You can read more here: https://www.investopedia.com/articles/01/022801.asp
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