'Why does python change the value in this list?

So this is my code but I can't understand why python behaves like that

row1 = ['⬜️', '⬜️', '⬜️']
row2 = ['⬜️', '⬜️', '⬜️']
row3 = ['⬜️', '⬜️', '⬜️']

map = [row1, row2, row3]

selectedRow = map[1]
selectedRow = ['X', '⬜️', '⬜️']

for row in map:
    print(row)

returns:

['⬜️', '⬜️', '⬜️']
['⬜️', '⬜️', '⬜️']
['⬜️', '⬜️', '⬜️']

but with

selectedRow = map[1]
selectedRow[0] = "X"

returns :

['⬜️', '⬜️', '⬜️']
['X', '⬜️', '⬜️']
['⬜️', '⬜️', '⬜️']

python list

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'Why does python change the value in this list?

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