That's not entirely true. The majority can make laws, but only such laws that don't impinge the freedom of others. In the US, the bill of rights was written down precisely for this reason - so that the majority cannot vote away the fundamental rights of minorities.
In most common law countries, including India, even an absolute majority cannot make laws that take away the freedoms and liberties of minorities.
Even if the entire US senate and congress, or the entire Indian parliament were composed of MPs representing one party, they cannot make laws that are unconstitutional.