<s>
Relations_NN2 between_II China_NP1 and_CC the_AT US_NP1 have_VH0 undergone_VVN many_DA2 difficult_JJ periods_NN2 ._. 
</s>
<s>
At_II an_AT1 earlier_JJR period_NN1 in_II history_NN1 before_II the_AT 1970s_MC2 ,_, the_AT United_NP1 States_NP1 considered_VVD China_NP1 "_" an_AT1 outlaw_NN1 nation_NN1 ._. "_" 
</s>
<s>
American_JJ governmental_JJ officials_NN2 refused_VVD to_TO deal_VVI with_IW the_AT Communist_JJ Government_NN1 of_IO China_NP1 ,_, which_DDQ it_PPH1 called_VVD "_" Red_JJ China_NN1 ._. "_" 
</s>
<s>
The_AT Chinese_NN1 called_VVN the_AT Americans_NN2 "_" running_VVG dogs_NN2 of_IO imperialism_NN1 ._. "_" 
</s>
<s>
The_AT American_JJ support_NN1 for_IF Taiwan_NP1 's_GE independence_NN1 and_CC its_APPGE willingness_NN1 to_TO go_VVI to_II war_NN1 with_IW China_NP1 to_TO protect_VVI Taiwan_NP1 from_II a_AT1 Chinese_JJ mainland_NN1 attack_NN1 ,_, then_RT and_CC more_RGR recently_RR ,_, has_VHZ caused_VVN an_AT1 ongoing_JJ difficulty_NN1 between_II the_AT two_MC countries_NN2 ._. 
</s>
<s>
Even_RR after_CS President_NNB Richard_NP1 Nixon_NP1 made_VVD his_APPGE historic_JJ trip_NN1 to_II China_NP1 in_II February_NPM1 ,_, 1972_MC ,_, with_IW the_AT joint_JJ signing_NN1 of_IO the_AT Shanghai_NP1 Communiques_NN2 ,_, there_EX have_VH0 been_VBN many_DA2 ups_NN2 and_CC downs_NN2 for_IF good_JJ relations_NN2 with_IW China_NP1 and_CC the_AT US_NP1 ._. 
</s>
<s>
In_II the_AT American_NN1 led_VVD war_NN1 against_II Serbia_NP1 ,_, the_AT Chinese_JJ Embassy_NN1 in_II Belgrade_NP1 was_VBDZ hit_VVN with_IW a_AT1 bomb_NN1 and_CC was_VBDZ substantially_RR damaged_VVN ._. 
</s>
<s>
The_AT United_NP1 States_NP1 apologized_VVD for_IF what_DDQ it_PPH1 called_VVD an_AT1 unfortunate_JJ accident_NN1 ._. 
</s>
<s>
In_II April_NPM1 2001_MC ,_, an_AT1 American_JJ spy_NN1 plane_NN1 and_CC a_AT1 Chinese_JJ fighter_NN1 plane_NN1 collided_VVN over_II Hainan_NP1 Island_NNL1 ,_, and_CC this_DD1 led_VVD to_II a_AT1 protracted_JJ set_NN1 of_IO negotiations_NN2 to_TO resolve_VVI this_DD1 issue_NN1 and_CC to_TO set_VVI the_AT American_JJ military_JJ and_CC the_AT aircraft_NN free_JJ ._. 
</s>
<s>
American_JJ ambiguity_NN1 about_II whether_CSW China_NP1 is_VBZ a_AT1 strategic_JJ competitor_NN1 or_CC strategic_JJ partner_NN1 has_VHZ caused_VVN more_DAR difficulties_NN2 ._. 
</s>
<s>
The_AT September_NPM1 11_MC ,_, 2001_MC terrorist_JJ attacks_NN2 against_II the_AT US_NP1 ,_, and_CC the_AT support_NN1 of_IO China_NP1 for_IF The_AT US_NP1 antiterrorist_NN1 campaign_NN1 ,_, have_VH0 greatly_RR improved_VVN relations_NN2 ._. 
</s>
<s>
Also_RR ,_, American_JJ support_NN1 for_IF China_NP1 's_GE entrance_NN1 into_II the_AT World_NN1 Trade_NN1 Organization_NN1 has_VHZ ._. 
</s>
<s>
been_VBN a_AT1 positive_JJ factor_NN1 ._. 
</s>
<s>
President_NNB George_NP1 W._NP1 Bush_NP1 's_GE 2001_MC attendance_NN1 with_IW Presidents_NN2 Putin_NN1 of_IO Russia_NP1 and_CC Jiang_NP1 Zemin_NP1 at_II the_AT Asia-Pacific_JJ Economic_JJ Forum_NN1 in_RP ,_, Shanghai_NP1 ,_, and_CC his_APPGE later_JJR February_NPM1 2002_MC visit_VV0 to_TO ._. 
</s>
<s>
China_NP1 celebrating_VVG the_AT thirtieth_MD anniversary_NN1 of_IO normalization_NN1 of_IO Chinese-American_JJ relations_NN2 has_VHZ been_VBN a_AT1 positive_JJ achievement_NN1 for_IF both_DB2 countries_NN2 ._. 
</s>
<s>
Overall_RR ,_, one_PN1 sees_VVZ the_AT prospect_NN1 of_IO better_JJR and_CC better_RRR economic_JJ and_CC political_JJ ties_NN2 for_IF both_DB2 countries_NN2 ._. 
</s>
