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Why are statements in many programming languages terminated by semicolons?

I just found out that R Programming Language, which is somewhat belong to the C family (I'm not sure about this but it uses {} instead of begin end), uses a new line as a delimiter for a new line of code instead of the semi-colon ;.

Why is some programming language designed to use a new line instead of a symbol like semi-colon which I think will make the code more readable?

Phyton

total = item_one + \
        item_two + \
        item_three

C

total = item_one +
        item_two +
        item_three;