What are the themes and devices used in this poem:
EXPLAIN:

Out of the belly of Christopher’s ship
a mob bursts
Running in all directions
pulling furs off animals
Shooting buffalo
shooting each other
left and right.

Father mean well
Waves his makeshift wand
Forgives saucer-eyed Indians

Red coated knights
gallop across the prairie
to get their men
to build a new world

Pioneers and traders
bring gifts
Smallpox, Seagrams
and Rice Krispies

Civilization has reached
the promise land.

Between the snap crackle and pop
of smokestacks
and multicoloured rivers
swelling with flower powered zee
are farmers sowing skulls and bones
and miners
pulling from gaping holes
green paper faces
of smiling English lady

The colossi
in which they trust
while burying
breathing forests and fields
beneath concrete and steel
stand shaking fists
waiting to mutilate
whole civilizations
ten generations at a blow.

Somewhere among the remains
of skinless animals
is the termination
to a long journey
and unholy search
for the power
glimpsed in a garden
Forever closed
Forever lost.