In both Britain and the United States, what happened in the 1870s that limited child labor? As unions became stronger, they didn't allow children under 14 to work Laws passed in both countries prohibited children under 14 from working Laws passed in both countries limited children to work only 8 hours a day Compulsory education and attendance laws were passed in both countries

## Step 1<br />The question is asking about the historical events in the 1870s in Britain and the United States that limited child labor. The options provided are:<br />- As unions became stronger, they didn't allow children under 14 to work<br />- Laws passed in both countries prohibited children under 14 from working<br />- Laws passed in both countries limited children to work only 8 hours a day<br />- Compulsory education and attendance laws were passed in both countries<br /><br />## Step 2<br />The correct answer is "Laws passed in both countries prohibited children under 14 from working". This is because, in the 1870s, both Britain and the United States passed laws that prohibited children under 14 from working. This was a significant step towards limiting child labor and ensuring that children had the opportunity to receive an education.<br /><br />## Step 3<br />The other options, while they may have some historical basis, are not the primary reasons for the limitation of child labor in the 1870s. For example, while unions did become stronger during this time, they did not specifically prohibit children under 14 from working. Similarly, while there were laws that limited the hours children could work, they did not specifically prohibit children under 14 from working. Finally, while compulsory education laws were passed, they did not specifically limit child labor.