<p>U.S. manufacturing unexpectedly contracted in November, falling to its lowest in over three years in a sign the sector may be struggling to gain traction, according to an industry report released on Monday.</p>
<p>The Institute for Supply Management (ISM) said its index of national factory activity fell to 49.5 in November from 51.7 the month before. The reading was shy of expectations of 51.3, according to a Reuters poll of economists.</p>