Why would Serbia want to discourage the republics of Yugoslavia from becoming independent?

With economic independence from Austria-Hungary came a mood for greater political independence. Serbian nationalism intensified and calls for Slavic liberation and unity increased. Even Serbia's King Peter expressed quite support for a Slavic super state in the Balkans, with Serbia as its beating heart

answer; seasons change because earth tilts on its axis; and the angle of the tilt causes the northern and southern hemisphere to trade places throughout the year;