Japan set to elect female prime minister in historic first

In the past twenty years, Japan has had more than 10 prime ministers.

In fact, one expert compares taking up the nation's highest office to taking a "cursed cup".

However, what is the reason does Japan keep changing leaders? It's due in part of it being a "single-party system", explains Professor James Brown of Temple University Japan.

The LDP's grip on the country's politics means the primary rivalry originates within the party, instead of from external parties.

"So within the LDP there are intense conflicts within various groups - they all desire their own clique to get the top job."

"So even though you could be selected as leader, the moment you're in power, you have dozens of people scheming to try to remove you again."

Main Reasons Behind Frequent Changes

• Single-party rule limits external competition
• Internal factional rivalries fuel power struggles
• The leadership role is frequently called a "cursed position"
• Political stability remains elusive despite financial power