You are touching a huge issue, - the issue of political sovereignty of Germany and probably the most closely guarded public misconception of the present day. To properly address your question I'd need lots and lots more space and time than just a short post. What I'll do instead is to present you with a synopsis of my future article that one day I'll have the time and inclination to write and let you connect the dots for yourself.

1). Go back to 1945 Occupation zones of Germany https://en.wikipedia.org/wiki/Allied-occupied_Germany
2). Try to understand the real agenda behind the Morgenthau Plan https://en.wikipedia.org/wiki/Morgenthau_Plan
3). Who and for what purpose created European Coal and Steel Community? Is this the Morgenthau Plan in action? https://en.wikipedia.org/wiki/European_Coal_and_Steel_Community
4). USA default on its Bretton-Woods obligations in 1971 and almost back-to-back introduction of The European Unit of Account (EUA)https://en.wikipedia.org/wiki/European_Unit_of_Account
5). European Exchange Rate Mechanism (EERM) and the introduction of The European Currency Unit (ECU) as a replacement of the EUA https://en.wikipedia.org/wiki/European_Exchange_Rate_Mechanism
6). EUR as a basket of currencies (index) derived from ECU. https://en.wikipedia.org/wiki/Euro
7). Unification of Germany and the only one condition to allow it by the Anglosphere after Moscow abandoned its occupation zone, which was delivered to then Chancellor of West Germany Mr. Helmut Kohl by the British-USA Frech puppet François Mitterrand, - i.e. a clear and unconditional commitment to abandon Deutsche Mark (= to abandon financial sovereignty) and to join the EUR from its inception.
8.) Is it by accident that EUR has a Central Bank but does not have a Central Treasury? Therefore, is it by accident the EMU Members have one currency unit but vastly different real interest rates?
9). Dollar Index (DX) as a basket of currencies https://en.wikipedia.org/wiki/U.S._Dollar_Index
10). The perfect negative correlation of two traded indices - DX vs. EUR
http://stockcharts.com/freecharts/perf.php?$XEU,$USD&n=200&O=011000

11). Conclusion.

1. EUR - is a Mechanism to neutralize German political and economic Sovereignty by financial means in replacement of the direct British, American and French occupation zones.

2. EUR as a mirror reflection of the weighted US Dollar together with the Dollar itself makes up a gigantic unified trans-Atlantic monetary pendulum which involves all the world's money into its swaying thereby providing Anglosphere with the global economic dominance tool box.

3. UK has always been and still is a Trojan horse in the EU. Together with maitaining EUR intact BREXIT - is a mechanism of creating and delivering political uncertainty and eventually political chaos into the main land Europe (read: Germany) to help dragging it down together with depreciating into oblivion the mighty King Dollar before the Global Financial System has been reset.