<s>
Empire	O
is	O
a	O
4X	B-Application
computer	B-Application
wargame	I-Application
created	O
in	O
1972	O
by	O
Peter	O
Langston	O
,	O
taking	O
its	O
name	O
from	O
a	O
Reed	O
College	O
board	O
game	O
of	O
the	O
same	O
name	O
.	O
</s>
<s>
It	O
was	O
initially	O
created	O
by	O
Langston	O
in	O
BASIC	O
on	O
an	O
HP2000	O
minicomputer	B-Architecture
at	O
Evergreen	O
State	O
College	O
.	O
</s>
<s>
The	O
game	B-Application
world	I-Application
consists	O
of	O
"	O
sectors	O
"	O
,	O
which	O
may	O
be	O
designated	O
as	O
agricultural	O
,	O
industrial	O
,	O
etc	O
.	O
</s>
<s>
Empire	O
is	O
a	O
turn-based	O
4X	B-Application
wargame	B-Application
,	O
where	O
players	O
command	O
armies	O
of	O
units	O
which	O
they	O
use	O
to	O
explore	O
the	O
game	B-Application
world	I-Application
,	O
control	O
territory	O
,	O
and	O
attack	O
opponents	O
.	O
</s>
<s>
The	O
game	B-Application
world	I-Application
consists	O
of	O
"	O
sectors	O
"	O
,	O
which	O
may	O
be	O
designated	O
as	O
agricultural	O
,	O
industrial	O
,	O
etc	O
.	O
</s>
<s>
As	O
such	O
,	O
a	O
full	O
game	O
can	O
take	O
much	O
longer	O
than	O
modern	O
4X	B-Application
games	I-Application
,	O
depending	O
on	O
the	O
size	O
of	O
the	O
game	B-Application
world	I-Application
;	O
"	O
Blitz	O
"	O
games	O
may	O
last	O
a	O
few	O
hours	O
,	O
while	O
typical	O
games	O
last	O
months	O
and	O
larger	O
games	O
can	O
take	O
up	O
to	O
a	O
year	O
to	O
complete	O
.	O
</s>
<s>
It	O
was	O
initially	O
created	O
by	O
Langston	O
in	O
BASIC	O
on	O
an	O
HP2000	O
minicomputer	B-Architecture
at	O
Evergreen	O
State	O
College	O
.	O
</s>
<s>
Subsequently	O
,	O
two	O
other	O
authors	O
each	O
independently	O
wrote	O
a	O
new	O
version	O
of	O
the	O
game	O
,	O
both	O
named	O
Empire	O
,	O
and	O
several	O
ports	O
of	O
the	O
game	O
were	O
created	O
for	O
other	O
computer	O
systems	O
,	O
such	O
as	O
PSL	O
Empire	O
for	O
the	O
PDP	B-Device
11/70	I-Device
,	O
and	O
a	O
version	O
with	O
added	O
weather	O
effects	O
for	O
the	O
VAX-11	O
.	O
</s>
<s>
Langston	O
,	O
now	O
at	O
Harvard	O
University	O
,	O
recreated	O
the	O
game	O
in	O
C	B-Language
,	O
and	O
shared	O
the	O
source	O
code	O
with	O
a	O
few	O
other	O
developers	O
;	O
disliking	O
the	O
changes	O
they	O
made	O
,	O
he	O
stopped	O
doing	O
so	O
,	O
maintaining	O
the	O
canonical	O
version	O
of	O
the	O
game	O
until	O
1985	O
,	O
when	O
he	O
stopped	O
development	O
.	O
</s>
<s>
Numerous	O
other	O
versions	O
were	O
created	O
over	O
the	O
next	O
decade	O
for	O
various	O
computer	O
types	O
,	O
including	O
KSU	O
Empire	O
,	O
Xerox	O
Development	O
Environment	O
(	O
XDE	O
)	O
Empire	O
on	O
Xerox	O
computer	B-Device
workstations	I-Device
,	O
PC	O
Empire	O
by	O
Gordon	O
Storga	O
for	O
DOS	B-Device
,	O
Amiga	B-Device
Empire	O
for	O
the	O
Amiga	B-Device
,	O
and	O
Wolfpack	O
Empire	O
.	O
</s>
<s>
In	O
1984	O
,	O
Ben	O
Norton	O
wrote	O
a	O
version	O
titled	O
Empire	B-Application
Classic	I-Application
in	O
Pascal	B-Application
on	O
an	O
HP3000	B-Device
and	O
released	O
to	O
the	O
HP3000	B-Device
Contributed	O
Library	O
,	O
which	O
became	O
the	O
definitive	O
version	O
until	O
the	O
Wolfpack	O
Empire	O
project	O
began	O
in	O
1996	O
.	O
</s>
<s>
In	O
2003	O
,	O
the	O
game	O
was	O
ported	O
to	O
the	O
C++	B-Language
programming	I-Language
language	I-Language
for	O
the	O
Linux	B-Application
operating	I-Application
system	I-Application
,	O
and	O
a	O
subsequent	O
Java	O
client/server	O
version	O
was	O
produced	O
.	O
</s>
