To prevent Google from redirecting you, all you need to do is place "/ncr" after Google.com without the quotes. This NCR means No Country Redirect.
Take note however that the country or region version of Google favors local websites in the search results page. This means you will likely to get results from websites that know your country better.
However, the redirection prevents you from seeing the original results of a Google search made in the US. This is particularly important for those who work in other countries but are based in the United States.