what did abraham Lincoln mean in his famous quote "a house divided against itself cannot stand". i believe this government cannot endure permanently half slave and half free".​

Lincoln meant that the country can't survive with half slavery and the other half without it. They have to come together as one nation.

Explanation:

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i believe

clean air is essential for health and survival

clean air provides nitrogen gas for plant respiration

clean air supplies oxygen that enables living organisms to breathe

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