Having great political powers means life and death. Many would attempt on an assassination to your life, that is if you're of a noble descent. Every high ranking official of each country has their own official cars. Many have it customized, and most of them are bullet-proofed. Once in a while see see official presidential and statesman cars in television program, in movies and if lucky enough, you can personally witness an state convoy consisting of at least 10 cars including the president's or the royal leader's car and motorcycles.
In the United States, presidents had a long list of presidential cars used in official tours. But all of this only fall mostly in either two brand, A Lincoln and a Cadillac limousine. Of course, a position as high as the President of the United Sates of America needs an ultra hard bullet-proofed vehicle. Official limousine of the US president is commonly known as Cadillac One.
Perhaps the most number of beautifully made official states car would be in the United Kingdom. The British Royal Family is teeming with expensive cars used for official states tour and for a normal roaming around day. They have a large number of the beautiful and rare models of the Rolls Royce Phantom IV.
German Chancellors and Presidents have almost exclusively used their native Mercedes Benz S-Class limousines and other cars like Audi A8, BMW 7 Series and Volkswagen Phaeton. While France, having some of the world's most expensive automakers have used multiple car makes of either a Renault Vel Satis, Peugeot 607 or a Citroen C6.
Japanese royalties have always used Toyota Century Royal and Century Celsiors as the official car but have also been spotted in the past to use a Nissan Prince Royal. Australia's Prime Minister uses a Holden Caprice.
Mostly high ranking officials, mainly presidents kings, queens and prime ministers uses Mercedes Benz, Lincoln and Cadillac as their official vehicle. Even in Asian countries MB is widely used. China, Indonesia, Malaysia, Singapore, South Korea and other uses Mercedes Benz, and all of them are bullet-proofed with special interiors.
Expensive as they are, but at least they got to keep the safety of the highest individuals in our very own lands.