Why did the Republicans pressurise Lincoln into making the war about slavery?

Hello Beaulah, so to my knowledge the reason the Republicans pressurised Lincoln into making the war about slavery was they new a compromise could not exist to solve the difference between the free and slave states regarding the power of the notional government to prohibit slavery in territories that had not yet become states.

you could use these points !

Moral and Political Pressure, Many Republicans, especially the Radical Republicans, were deeply opposed to slavery on moral grounds. They believed that the war should be fought not just to preserve the Union but also to abolish slavery. This would align with their vision of a nation founded on freedom and equality.

Political Strategy, By making the war about slavery, Lincoln could gain more support from abolitionists and anti-slavery Northerners, which would strengthen the Union war effort. Slavery was a deeply divisive issue, and by taking a strong anti-slavery stance, Lincoln could rally those who were committed to ending slavery.

International Influence, The Republicans believed that making the war about slavery would prevent foreign nations, like Britain and France, from recognizing or supporting the Confederacy. These countries had already abolished slavery, and they were less likely to support a Confederacy that was fighting to preserve it.

The Emancipation Proclamation, ( v important!! ) Initially, Lincoln was reluctant to make the war about slavery because he feared it would alienate Border States (slave states that remained in the Union) and undermine the Union's unity. However, as the war progressed, Lincoln came under increasing pressure from Republicans to take a stronger stance. This led to the Emancipation Proclamation in 1863, which declared that all slaves in Confederate-held territory were free.