sentences:  Although she had supported British membership, Thatcher believed that the role of the EC should be limited to ensuring free trade and effective competition, and feared that new EC regulations would reverse the changes she was making in the UK, stating that she had "not successfully rolled back the frontiers of the state in Britain" only to see her reforms undermined by "a European super-state exercising a new dominance from Brussels".She was specifically against Economic and Monetary Union, through which a single currency would replace national currencies, and for which the EC was making preparations.The speech caused an outcry from other European leaders, and exposed for the first time the deep split that was emerging over European policy inside her Conservative Party.