Border Reivers were a problem through the 12-13th century and
Chorley was sacked by the Scotts & Robert the Bruce in 1322.
Lancashire caused problems during the Tudor reign as a centre
for Catholicism. In the 1760s the early developments began in
the north of the Industrial revolution, probably the greatest
milestone in our history. The damp weather in the north-west was
ideal for the cotton industry and many immigrant labourers came
in from Ireland and Scotland to help build the mills, canals and
railways. This development caused a massive population explosion
and many employed in agriculture migrated to the towns and
mills. Today the Northern economy is still larger than many
Brian Groom with his book
Northerners from the Ice Age to the 21st century.