Why did workers join together in unions?

To present a United Front against employers to bargain for better Pay and Working Conditions

  Usually, when workers were had bad working conditions, they went on strike. Most were scared to go on strike because they were arrested and were fired from their job. Therefore, many decided to join together and form unions because this way, they could not be fired because unions contained a huge amount of people. If all these people were fired, many owners would run out of business. 
  To join these unions, many worked together to get better working conditions and rights. They went on strike and went against poor working conditions. They wanted higher wages.

To sum this up: Many joined unions so that they may not be fired from their job while still being able to strike for better working conditions. 

Hope I helped. :)

The economics south america are similar because they have a lot of production and selling similar to wat

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.