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Increased travel and communication have led to greater cultural exchange, increased global understanding, and the proliferation of ideas and innovations across borders.
Post Office.
Quality and ease of mechanization are the factors that have led to the increased use of the GMAW process.
a system for harvesting crops more easily
Cotton gin
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It led to an increased need for transportation.
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the increase of populaion
Nativism and racism increased in the 1920s and led to changes in Immigration laws.
In some cases the consumption of fish has been led to Mercury Poisoning. Mercury is present in many types of ocean dwelling fish, and while present is generally not harmful (unless consumed in large quantities) to the individual ingesting the fish.