The thing of it is, the history of this poster's nation shows that it was doing the same thing contemporaneously with the burgeoning young nation of the US. They even fought wars (like the war of 1812), etc. for the "right" to do it here rather than let us do it ourselves. The assumption that the US should solely hold the guilt for the policy of the past is based on the ability to ignore the reality of the history of his own nation.
There is a reason that English is the official language of India and it wasn't because they were nice to them. There is a reason that Canada exists, and it wasn't without its own slaughter. France was spreading itself to this place as well, there is a reason that we were able to make the Louisiana purchase and it wasn't because France didn't participate in that same slaughter. There is a reason that they speak Spanish and Portuguese in South America, and it isn't because Spain and Portugal weren't participating in that same slaughter...
These people who try to judge were, at the same time the US was, spreading through the exact same actions.
The history of the British Raj is far more complex than is given credit for, especially in the US. Otherwise how was it possible for a colonial staff of around 100,000 to control a country of over 400 million in the 19th century. Here is a breakdown of the good and the bad.
Good points
Stabilization of the Land Tax
Before British rule, all Indians paid a land tax to the local ruler. Sometimes, this would be sharply increased if a ruler had a need for extra money. The British collected the Land Tax themselves once they took over, but kept it at the same level throughout.
Replacement of despotic rule by the rule of law.
Indian rulers were despots who did as they pleased. The British had laws that were the same for all Indians and that were generally enforced.
The British built roads, railways, schools, universities and cities.
Aboiltion of Sutee and Thugee
Before British rule, Hindu widows were burned alive on their dead husbands' funeral pyres. The Thugee cult had murdered literally millions of Indians over the centuries, in worship of the goddess Kali. The British stamped out both.
Opportunity for the average Indian to better themselves
For example, they could join the army and later, the civil service.The British made no distinction through caste when recruiting Indians; caste determined an Indian's occupation within their own society and culture. Even today the caste system casts a long shadow over India.
Bad Points
Repatriation of Wealth
The wealth and natural resources of India was used to benefit Britain and its empire, not India
Political Freedom
There was no political freedom of self determination for the native population.The British made all the rules and laws and Indians were allowed little role in government. There were no elections and no Indian officials.
Cultural Reform
There was no attempt to reform Indian culture. Other than the abolition of sutee and thugee, there was no interference with religious beliefs and practices, no attempt to reform the caste system or the restructuring of Hindu society (most Indians were Hindus).
Religious Divide
The British made little attempt to reconcile Muslims and Hindus in India resulting in the partition of India in 1947.