Answer:
Because it stopped further Ottoman spreading in Central and Western Europe.
Explanation:
Suleiman is regarded as the greatest of the Ottoman sultans. Since he arrived on the throne, he managed to spread his country. In 1521 he conquered Belgrade, and after the battle of Mohacs he managed to open the door towards the capital of Habsburg Monarchy.
Still, as he didn't managed to conquer the capital, he had to retreat. His failure to capture Vienna, prevented the Ottomans to spread their domain across the Europe.
A. complex sentences have many cluses
She developed a new strategy to pursue women's voting rights