<s>
Sid	B-Application
Meier	I-Application
's	I-Application
Civilization	I-Application
IV	I-Application
:	I-Application
Warlords	I-Application
is	O
the	O
first	O
official	O
expansion	O
pack	O
of	O
the	O
critically	O
acclaimed	O
turn-based	O
strategy	O
video	O
game	O
Civilization	B-Application
IV	I-Application
.	O
</s>
<s>
Three	O
new	O
leader	O
traits	O
(	O
Charismatic	O
,	O
Protective	O
and	O
Imperialistic	B-Application
)	O
.	O
</s>
<s>
Inclusion	O
of	O
all	O
patches	O
released	O
for	O
original	O
Civilization	B-Application
IV	I-Application
.	O
</s>
<s>
When	O
an	O
empire	O
becomes	O
a	O
vassal	O
,	O
it	O
loses	O
the	O
ability	O
to	O
declare	O
war	O
and	O
make	O
peace	O
independently	O
,	O
and	O
may	O
be	O
called	O
upon	O
to	O
pay	O
"	O
tribute	O
"	O
in	O
the	O
form	O
of	O
game	O
resources	O
to	O
its	O
"	O
master	O
"	O
(	O
suzerain	B-Application
)	O
state	O
in	O
return	O
for	O
the	O
promise	O
that	O
its	O
master	O
will	O
protect	O
the	O
vassal	O
.	O
</s>
<s>
New	O
civilizations	O
include	O
Carthage	O
,	O
the	B-Algorithm
Celts	I-Algorithm
,	O
Korea	O
,	O
the	O
Ottoman	O
Empire	O
,	O
the	B-Application
Vikings	I-Application
,	O
and	O
the	O
Zulu	O
.	O
</s>
<s>
Warlords	O
includes	O
new	O
music	O
and	O
also	O
features	O
older	O
music	O
directly	O
from	O
Civilization	B-Application
III	I-Application
and	O
Civilization	B-Application
III	I-Application
:	I-Application
Conquests	I-Application
,	O
which	O
augment	O
the	O
game	O
's	O
existing	O
ancient	O
and	O
classical	O
era	O
music	O
that	O
had	O
relatively	O
few	O
selections	O
.	O
</s>
