In fact, they believe that workers generally do not unite to revolt. Capitalism sets up a system of competition in which people work against each other, as the unemployment rate increases. Thus, workers discriminate against each other on the basis of race and gender and therefore cannot form a united front. Even if workers revolt, their opponents believe they are not a force powerful enough to overthrow social structures that have existed for centuries. However, in the 21st century, discrimination is a serious problem and is not accepted by society. Thus, discrimination is becoming less and less common, since judgments based on race or sex have become frowned upon. Additionally, workers formed several unions overcoming discrimination. In the United States, 14.5 million workers are members of a union. These unions are seeking better collective working conditions and have succeeded in increasing the salaries of their employees..