At the turn of the 20th century, the majority of the working poor lived

The majority of the working poor lived in the inner-city tenements at the turn of the twentieth century due to the fact that the factories where they were working were located in the cities.  Tenements made the living condition of the working poor unsafe during this time.

.elections are held to determine who serves in congress.

brainliest is someone you pick by simply clicking a button. it only shows up if there are two people that answered your question, then you decide who answer more accurately with detail and explanation and you give that person the title "brainliest".

i hope this your understandings.