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What are at least three things a colony needs to successfully achieve autonomy? democratic form of government capitalistic economic system numerous treaties with others a formal, written constitution oversight by the home country foreign trade market established

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The three things a Colony needs to triumphantly or successfully achieve autonomy are "a formal, written constitution," "oversight by the home country," "foreign trade market established".

The three things a colony needs to successfully achieve autonomy are:

1- Democratic form of government: so that the population can freely choose their Governors and Representatives. And thereby have elected and non-monarchical authorities

2- Capitalistic economic system:  since through it a country can produce, market and distribute externally or internally. At the same time, also buy or exchange products for your benefit. Likewise, the globalized world moves with a capitalist system and economic profitability is necessary to have political freedom

3- A formal, written constitution:  to respect, protect, promote and guarantee the fundamental rights of citizens.