By default, the application will be available in all countries supported by the App Store, unless you specifically select individual countries / stores. You can select individual countries. iTunesConnect in to iTunesConnect and click Manage Your Apps. Select your application and click the Rights and Pricing button. You can choose the stores you want from this page. For more information, you can view page 48.
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As updated The easiest way to solve this topic is probably to decide in which countries you want to make your application available? and since I have a search similar to a country overview, local laws to find out if any thing is illegal related to the application. And this applies to your Questions.
What if I make my application available in other countries than usa?
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