Pulsating from driver's front wheel; even tread wear, no play

What is your question?

1997 Ford Escort LX sedan has a vibration/humming/pulsating coming from the driver's side front wheel that has gradually been worsening for probably the last 20,000 miles. New front tires 10,000 miles ago and tread wear is perfectly even. No play in the wheel whatsoever from side to side or up and down. All boots are intact. Any ideas? Thanks!