If you want to rank for India and USA, you should not buy a country specific domain. 
The following tips will help you to rank for USA.
-   Get .com or .net domain. Do not buy .in domain.
-   Host your website in USA
-   Build backlinks from .com or .net domains
-   Use USA keywords in the keywords.

The following tips will help you to rank for India.
-   Get .in domain
-   Host your site in India
-   Build backlinks from .in domains
-   Add the keyword ‘India’ to your content.