Amid the ongoing United States stock market rally, several equities have experienced increased buying pressure, pushing their valuations closer to the coveted $1 trillion market capitalization mark.With the new year on the horizon, the following two U.S. companies are increasingly showing the potential to break into the trillion-dollar club, driven by ambitious fundamentals.Oracle (NASDAQ: ORCL)At roughly$867 billion in market value, Oracle (NASDAQ: ORCL) is only 15% away from the trillion-dollar threshold ...