I guess cause they are so close.
During the first industrial revolution, the affected nations moved from a rural economy, based on agriculture and trade, to an urban, industrialized, mechanized, simplified and, thus, overcrowded economy. In 1800 it was possible to have a sustained growth of wealth that allowed the transition to a wide use of innovative machines, especially in transport and work, abandoning animal traction and production based on manual labor.
During the second industrial revolution The exponential development of railways, while structuring a new model of international trade based on the specialized production of each country and the exchange of materials from standardized prices, also enabled huge migratory movements, like boiler boats that even transported large masses of people on intercontinental trips, as was the case of the 55 million Europeans who migrated to North America between 1850 and 1940.
The cause of the great migrations during the second industrial revolution was, mainly, the tremendous demographic growth that there was in Europe during the eighteenth century, which in turn had different causes.
CORE issues a report claiming that the U.S. military draft places “a heavy discriminatory burden on minority groups and the poor”.
<u>The answer is "A group that has concerns about a narrowly defined subject". </u>
A single-issue interest group is a formal organization that has concerns about a narrowly defined subject and aimed to influence policy in order to create, maintain or change that particular subject. Some examples of what a single-interest group are interested in are animal rights, abortion, foreign policy, police brutality, gay rights, defending legal use of guns, etc.
In overall, they aim to achieve its purpose by lobbying government (including members of Congress, the executive branch, etc.), engaging in election activities, educating people about their interests, activities, relevance, current issues, etc., mobilizing people who act on behalf of the organization in order to perform activities, such as writing letters, making phone calls and demonstrating.