Question

As the European power grew more industrialized their colonies became very important as a source of what.

Answer 1

As the European power grew more industrialized their colonies became very important as a source of raw materials, such as iron, that were needed in the factories back in Europe.

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Answer 2

As the European power grew more industrialized their colonies became very important as a source of raw materials, such as iron, that were needed in the factories back in Europe.