The world economy is dominated by the world's largest arms dealer by far, the USA.
But it's a much bigger problem than that, as the "directors" are an international banking consortium that control much, much more than arms production alone... they control the world-wide banking system (for example, The FED (controller of the US dollar) and the International monetary fund) and rule the world through debt. This cartel has been around since the slavery days... once, the UK was the headquarters, but now, the USA plays that role.
As this post demonstrates, war is the most fantastic source of profit for them.
They are not nationalist, but they USE nationalism for profit. They often arm and loan money to both sides of a conflict. This ruling class is not one family (like Rockefeller) or bank (like Bank of America), but a collection of the most powerful families and organizations that control generations of wealth.
Also, there's a lot of misinformation out there to shield them from criticism, they are masters of propaganda. Deceit built upon deceit, conspiracies (true and false) abound. Never, ever believe any one source, or any three sources for that matter. Today, most news organizations are either owned by them, or controlled by them via other means.
History is the key to knowledge. Now, the web is so complex that it's hard for one person to fathom, but it becomes much easier to grasp if you start at the source and observe their public history over the decades.
Deutsch Bank, JP Morgan, Wells Fargo, all serve on each others board (and The FED) and are all part of this cartel. Start at the 1800s and research from there, just pick one...