Depends on the time period, but a theme was that money changers stimulated trade and help in the development of growing economies as the trade between different regions occur or happen during that time period.
<span>a speech that explains why unemployment has risen
Would be the best example of cause and effect
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Originally, colonialism had caused a great divide between the the colonial slaves and Spanish and Portuguese people. However, owing ti the contact between slaves and owners in these colonoes, the concept of equality between races became easier to grasp for the South Americans. They started viewing the race barriers more open-mindedly. Moreover, cross-mixing caused numerous social classes to be created of mixed race.
Socialism however this later failed too i believe... hope i helped