History is most unforgiving. As historical mistakes cannot be undone, they have complex cascading effect on a nation's future. Here are seven historical blunders that have changed the course of independent India's history and cast a dark shadow over its future. These costly mistakes will continue to haunt India for generations. They have been recounted here in a chronological order with a view to highlight the inadequacies of India's decision-making apparatus and the leadership's incompetence to act with vision.