China trimmed its holdings of US Treasuries to an 18-year low in April as it continued to diversify its foreign reserves amid heightened geopolitical tensions and growing concerns over the independence of the US Federal Reserve.Data released by the US Treasury Department on Thursday showed that Chinese investors’ US Treasury holdings fell from US$652.3 billion in March to US$651.1 billion in April, the lowest level since September 2008, based on figures compiled by financial data provider...